Filter frame or leaf.



O. J. SALISBURY.

FILTER FRAME 0R LEAF. APPLICATION FILED MAR. I8. 1916- RENEWEDAUG-4.1911- Patented 15 11, 1917.

F f r JZ I I y I l? ORANGE J'. SALISBURY, OF SALT LAKE CITY, UTAH.

FILTER FRAME R LEAF.

reaogsaS.

Specification of Letters Patent. Patented Dec. 11, 1917.

Application filed March 18, 1916, Serial No. 85,177. Renewed August 4,1917. Serial No. 184,532.

' T 0 all whom it may concern:

or leaf thereof which carries and supports the filtering sides of thefabric which is designed to separate the liquid from the solidconstituents of the pulp or material to be filtered.

A leading object of the present invention I is to so construct a filterframe or leaf that it maybe readily disconnected and removed fromassociation with other filtering units without causing any disturbanceof the latter.

A further object of the invention is to make the filter frame or leaf ofa sectional character to facilitate repairs and to simplify the removalof the leaf and the substitution of a new leaf.

With the above and other objects in view, my invention consists of theparts andv the constructions, arrangements and combinations of partswhich I will .hereinafter describe and claim.

In the accompanying drawings forming part of this specification and inwhich similar reference characters indicate like parts in the severalviews;

Figure 1 is a side view with parts broken away, of a filtering unit,showingone embodiment of my invention.

Fig. 2 is a similar view of one of the sections of the filtering unitdetached.

Fig. 3 illustrates an edge view of a plurality of spaced filtering unitsmounted on a common central support.

Fig. 4 is an enlarged section of the joint between the meeting edges ofsections of the filtering unit.

Fig. 5 illustrates another form of filter leaf or unit embodying myinvention,

Fig. 6 is an edge View of a plurality of filter leaves or units. similarto Fig. 5, connected to an external header.

Fig. 7 is an enlarged cross-section on the line XX of Fig. 1. I

In carrying out my invention I prefer to design the filter leaves orframes of a general circular form whereby they are adapted for use inany of the pressure, suction or other filters using or capable of usingcircular filtering frames or units.

The filter leaves or frames and by which term I will hereinafter referto the filter units, are of disk-like form and they may be open orclosed at the center, this depending upon whether the filtrate is to bedelivered from the center or the circumference of the leaf or frame. Ineither case, however, the filter leaf or frame is, preferably, composedof a plurality of similar sections whoseabutting edges are closed anddesigned to be interlocked or fastened one to the other, or secured insome other suitable manner to unite the sections in a rigid whole.

The filter leaf shown in Fig. 1, has its frame or leaf, A, composed ofsections having closed abutting edges and inner and outer bindingbandsor strips, 10--11, respectively and a connecting woven wire orother foraminous support which forms a backing, B, for the outerflexible filtering sides, 0, of the sections. These filtering sides, C,are of sheet-form and are usually made'of fibrous material; they mayrepresent any of the fabrics commonly used forfiltering purposes, andwhich while permitting the separated liquid, or filtrate to pass to theinterior of the section, will collect upon the outer surface incake-form, the

solid constituents of pulp or solution under treatment. The fabricfiltering sides, 0

may be Secured to the interior support or,

backing, B, in any 'well known manner, as by lines of stitchingextending through the fabrics and through the foramina or openlngs 1nthe backing plate, and which backing plate may have its inner and outeredges extending into slot formed in the inner and outer binding stripsor bands, 1011, which are herein shown as in the form of flattenedtubes, Fig; 7, which-arrangement allows the filtered liquid to entersaid tubes and from which it may be drawn or delivered to a pointoutside the frame. In the form of open-center frame, A, shown in Fig. 1,the

filtered liquid may be conducted from the inner binding band, 10, into acentrally disposed discharge pipe, G, by means of an appropriate union,H, said pipe being similarly connected to and extending centrally of aseries of filtering leaves or frames when spaced apart, as in Fig. 3,and forming a rigid support for the same, said tube being mounted inbearings, 13-13, whereby the pipe and attached filtering leaves orframes may be rotated.

section, which arrangement holds the sections rigidly together and yetwill allow for a separation of the sections by a movement of one sectionrelatively to the other section in a plane which is parallel to the axisof the filter leaf and which operation may be readily effected when theunion, H, connecting the movable section to the central discharge pipeis uncoupled therefrom.

the shaft, 1, to an exterior header,

If desired and to aid in securing the sections of the filter leaf,suitable soft iron or other pins, F, may be passed transversely throughthe dove-tailed parts and through the flattened tubular binding bands,as shown in Fig. 4.

In the form of filter leaf or frame, A shown in Figs. 5 and 6, thecenter of the same is closed except for an opening to admit the shaft,I, and which and the walls of the semi-circular openings in themeetingfaces of the sections of the filter leaf or frame, are grooved toadmit the dove-tailed keys, J, which detachably lock the sections toeach other and to the shaft I, which latter may be mounted for rotationin bearings, 16.

In the form of filter leaf or frame shown in Figs. 5 and 6, there is aperipheral discharge of the filtered liquid which has passed to theinterior of the leaf or frame and to this end, a union, K, connects thesections of the filter leaf or frame, or any numberof the same placedside by side on L, which in' turn connects by pipe, M, with a chamber,N, from whence leads a filtrate discharge tube, 0.

- From the foregoing it will be apparent that in either of the forms offilter leaves or frames shown each part or section thereof is arunit initself; that is, each of the segments of the filter leaf or frame isfastened in such manner that it may be readily detached withoutdisturbing the companion section.

It will be understood that my improved construction of filter leaf isdesigned for use in either suction or pressure filters where it isdesirable to have a rotation of the filter leaf itself, either duringfiltration or when discharging the cake, or at any of the steps of thefiltering cycle.

I am aware that circular filter leaves have heretofore been used inrotary filters, but the construction of the same has heretofore beensuch that the removal of the leaves and the substitution of new leavesfor old or damaged ones was attended with great difliculty and at theexpense of considerable time. In the case of my improved filter leaf, ifit should become necessary to change the leaf or to repair or renew thefiltering fabric the removal of the particular leaf or leaves is readilyeffected through the agency of the union, H, which connects the leaf tothe central filtrate pipe of Fig. 1, or by unscrewing the union, is,which connects the leaf to the outside header, in the construction shownin Fig. 5, and then separating the sections by sliding one relatively tothe other through the agency of the dove-tailed connections between themeeting edges of the sections. One leaf may, therefore, be removedwithout disturbing other leaves of the group with which the filter maybe provided; or one section of a single leaf may be removed withoutdisturbing the companion section of the same leaf. The number ofsections employed for individual filter leaves is unimportant and whileI show the leaves as composed of two similar sections I do not wish tobe understood as limiting myself thereto.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. A filter leaf or frame composed of sections each of which,constitutesa filtering -unit having its own filter medium and interior chamber forfiltrate, and means for removably securing the sections to each other insubstantially a common plane.

2. A filter lea f or frame composed of sections each of which includes afiltering medium and a foraminous backing therefor, said sections beingclosed at the edges and means for securing the sections to each other ina common plane to form a complete filter leaf or frame.

3. A sectional filter leaf or frame the sections whereof include spacedfiltering sides and a filtrate chamber thercbetween, said sectionshaving meeting edges fashioned to interlock to unite the sections andform a complete filter leaf or frame.

4. A sectional filter leaf or frame the sections whereof are ofsegmental form and each includes a filter medium and a foraminousbacking therefor, said sections abutting edgewise and the edges of thesections havtions each including concentric binding bands and aconnecting foraminous structure, and a filtering medium overlying saidstructure, and means for securing the sections edgewise to each other toform a filter leaf or frame of circular form.

(LA. filter leaf or frame formed of a plurality of sections of segmentalform and each including afiltering medium and a foraminous backingtherefor, means for connecting the sections edgewise in a common planeto forma complete leaf or frame of circular outline, a header connectingwith the interior of said sections, and detachable couplings between theheader and the individual sections ofthe leaf or frame.

7. The combination with aheader and means whereby it is rotatablymounted, of

a filter leaf or frame formed of a plurality of sections each comprisinga filtering agent and a foraminous backing therefor, and means forbinding the edges of the sections, means independently detachablyconnecting the edges of one section to the corresponding edges ofanother section, and independent detachable couplings between thesections and the header permitting the removal of any section withoutdisturbing the others.

8. A filter leaf or frame formed of a plurality of sections each ofwhich constitutes a filter unit having a filtering surface, a filtratechamber and a foraminous backing for said surface, each of said sectionsbeing closed at the inner, outer and abutting edges,

means for detachably uniting the abutting edges of the sections to forma complete filter or frame, a header forming a common conduit for thefiltrate of the several sections and detachable connections between eachsection and said header permitting a section to be removed withoutdisturbing the other sections. a

9. A filter leaf or frame formed of a plurality of sections each ofwhich constitutes a filter unit having a filtering surface, a filtratechamber and a foraminous backing for said surface, :each of saidsections being closed at the inner, outer and abutting edges, means fordetachably uniting the abutting edges of the sections to form a completefilter or frame, a header forming a common conduit for the filtrate ofthe several sections and detachable connections between each section andsaid header permitting a section to be removed without disturbing theother sections, said header and filter leaf or frame being mounted forrotation in unison. v

Intestimony whereof I afiix my signature.

ORANGE J; SALISBURY.

